Sobel, Robert, author
The Entrepreneur : explorations within the American business tradition
Weybright and Talley, 1974
 Buku Teks
Pelfrey, William, author
Billy, Alfred, and General Motors: the story of two unique men, a legendary company, and a remarkable time in American history
American Management Association, 2006
 eBooks
Rogers, Wayne, author
Make your own rules : a renegade guide to unconventional success
Amacom, 2011
 Buku Teks
Concise dictionary of American biography
Charles Scribner's Sons, 1964
 Buku Referensi
Dikty, T.E.
Every boy's book of American heroes / T.E. Dikty
Frederick Fell, Inc., 1963
 Buku Teks
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